Wayne, K8FF, has developed a true spinner knob to
replace the FT-817(ND) tuning knob. This quality knob is made from
billet annodized aluminum and is precision made on a CNC turning
center in the USA. It is a direct replacement for the stock knob and
uses your stock rubber friction ring around the outside. It takes
only a couple of minutes to swap the knob with the 1.5mm allen wrench
(supplied with the KRANKER) Great for pedestrian mobile, set your
tuning rate to the slowest setting and krank away.

W4WB and AB4MT of W4RT Electronics have the Kranker
Knob installed on their FT-817's and really liked the added ease of operation!